{"product_id":"sudoku-mariano-juan-lobaton-9798706702434","title":"Sudoku: 300 Intermediate level puzzles 8.5 x 11 book# 3","description":"\u003cul\u003e \u003cli\u003eNumber puzzles appeared in newspapers in the late 19th century, when French puzzle setters began experimenting with removing numbers from magic squares. Le Si cle, a Paris daily, published a partially completed 9 9 magic square with 3 3 subsquares on November 19, 1892. 7] It was not a Sudoku because it contained double-digit numbers and required arithmetic rather than logic to solve, but it shared key characteristics: each row, column and subsquare added up to the same number.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\u003cul\u003e \u003cli\u003eOn July 6, 1895, Le Si cle's rival, La France, refined the puzzle so that it was almost a modern Sudoku and named it carr  magique diabolique ('evil magic square'). It simplified the 9 9 magic square puzzle so that each row, column, and broken diagonals contained only the numbers 1-9, but did not mark the subsquares. Although they are unmarked, each 3 3 subsquare does indeed comprise the numbers 1-9 and the additional constraint on the broken diagonals leads to only one solution. 8]\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\u003cul\u003e \u003cli\u003eThese weekly puzzles were a feature of French newspapers such as L' cho de Paris for about a decade, but disappeared about the time of World War I. 9]\u003c\/li\u003e\n\u003c\/ul\u003e\u003cbr\u003e\u003cbr\u003e\u003cb\u003eAuthor:\u003c\/b\u003e Mariano Juan Lobaton\u003cbr\u003e\u003cb\u003eISBN-10:\u003c\/b\u003e 8706702430\u003cbr\u003e\u003cb\u003eISBN-13:\u003c\/b\u003e 9798706702434\u003cbr\u003e\u003cb\u003ePublisher:\u003c\/b\u003e Independently Published\u003cbr\u003e\u003cb\u003eLanguage:\u003c\/b\u003e English\u003cbr\u003e\u003cb\u003ePublished:\u003c\/b\u003e 02\/08\/2021\u003cbr\u003e\u003cb\u003ePages:\u003c\/b\u003e 110\u003cbr\u003e\u003cb\u003eFormat:\u003c\/b\u003e Paperback\u003cbr\u003e\u003cb\u003eWeight:\u003c\/b\u003e 0.60lbs\u003cbr\u003e\u003cb\u003eSize:\u003c\/b\u003e 11.02h x 8.50w x 0.23d","brand":"Mariano Juan Lobaton","offers":[{"title":"Paperback","offer_id":44070589071615,"sku":"9798706702434","price":7.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0662\/2982\/9887\/files\/img_f2fe19ef-10d7-4a75-9ab1-ab9d7fe17e56.jpg?v=1685431200","url":"https:\/\/www.whiterainbookhouse.com\/products\/sudoku-mariano-juan-lobaton-9798706702434","provider":"WR Book House","version":"1.0","type":"link"}